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jtag: only change state if necessary
[openocd.git] / src / jtag / drivers / amt_jtagaccel.c
blob5005e7633f62be950681bf0bb89f0882c4f8fc84
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * This program is free software; you can redistribute it and/or modify *
6 * it under the terms of the GNU General Public License as published by *
7 * the Free Software Foundation; either version 2 of the License, or *
8 * (at your option) any later version. *
9 * *
10 * This program is distributed in the hope that it will be useful, *
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13 * GNU General Public License for more details. *
14 * *
15 * You should have received a copy of the GNU General Public License *
16 * along with this program; if not, write to the *
17 * Free Software Foundation, Inc., *
18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
19 ***************************************************************************/
20
21 #ifdef HAVE_CONFIG_H
22 #include "config.h"
23 #endif
24
25 #include <jtag/interface.h>
26
27 #if PARPORT_USE_PPDEV == 1
28 #include <linux/parport.h>
29 #include <linux/ppdev.h>
30 #include <sys/ioctl.h>
31 #else /* not PARPORT_USE_PPDEV */
32 #ifndef _WIN32
33 #include <sys/io.h>
34 #endif
35 #endif
36
37 #if PARPORT_USE_GIVEIO == 1
38 #if IS_CYGWIN == 1
39 #include <windows.h>
40 #endif
41 #endif
42
43 /**
44 * @file
45 * Support the Amontec Chameleon POD with JTAG Accelerator support.
46 * This is a parallel port JTAG adapter with a CPLD between the
47 * parallel port and the JTAG connection. VHDL code running in the
48 * CPLD significantly accelerates JTAG operations compared to the
49 * bitbanging "Wiggler" style of most parallel port adapters.
50 */
51
52 /* configuration */
53 static uint16_t amt_jtagaccel_port;
54
55 /* interface variables
56 */
57 static uint8_t aw_control_rst;
58 static uint8_t aw_control_fsm = 0x10;
59 static uint8_t aw_control_baudrate = 0x20;
60
61 static int rtck_enabled;
62
63 #if PARPORT_USE_PPDEV == 1
64 static int device_handle;
65
66 static const int addr_mode = IEEE1284_MODE_EPP | IEEE1284_ADDR;
67
68 /* FIXME do something sane when these ioctl/read/write calls fail. */
69
70 #define AMT_AW(val) \
71 do { \
72 int __retval; \
73 \
74 __retval = ioctl(device_handle, PPSETMODE, &addr_mode); \
75 assert(__retval >= 0); \
76 __retval = write(device_handle, &val, 1); \
77 assert(__retval >= 0); \
78 } while (0)
79 #define AMT_AR(val) \
80 do { \
81 int __retval; \
82 \
83 __retval = ioctl(device_handle, PPSETMODE, &addr_mode); \
84 assert(__retval >= 0); \
85 __retval = read(device_handle, &val, 1); \
86 assert(__retval >= 0); \
87 } while (0)
88
89 static const int data_mode = IEEE1284_MODE_EPP | IEEE1284_DATA;
90
91 #define AMT_DW(val) \
92 do { \
93 int __retval; \
94 \
95 __retval = ioctl(device_handle, PPSETMODE, &data_mode); \
96 assert(__retval >= 0); \
97 __retval = write(device_handle, &val, 1); \
98 assert(__retval >= 0); \
99 } while (0)
100 #define AMT_DR(val) \
101 do { \
102 int __retval; \
103 \
104 __retval = ioctl(device_handle, PPSETMODE, &data_mode); \
105 assert(__retval >= 0); \
106 __retval = read(device_handle, &val, 1); \
107 assert(__retval >= 0); \
108 } while (0)
109
110 #else
111
112 #define AMT_AW(val) do { outb(val, amt_jtagaccel_port + 3); } while (0)
113 #define AMT_AR(val) do { val = inb(amt_jtagaccel_port + 3); } while (0)
114 #define AMT_DW(val) do { outb(val, amt_jtagaccel_port + 4); } while (0)
115 #define AMT_DR(val) do { val = inb(amt_jtagaccel_port + 4); } while (0)
116
117 #endif /* PARPORT_USE_PPDEV */
118
119 /* tap_move[i][j]: tap movement command to go from state i to state j
120 * 0: Test-Logic-Reset
121 * 1: Run-Test/Idle
122 * 2: Shift-DR
123 * 3: Pause-DR
124 * 4: Shift-IR
125 * 5: Pause-IR
126 */
127 static uint8_t amt_jtagaccel_tap_move[6][6][2] = {
128 /* RESET IDLE DRSHIFT DRPAUSE IRSHIFT IRPAUSE */
129 { {0x1f, 0x00}, {0x0f, 0x00}, {0x05, 0x00}, {0x0a, 0x00}, {0x06, 0x00}, {0x96, 0x00} }, /* RESET */
130 { {0x1f, 0x00}, {0x00, 0x00}, {0x04, 0x00}, {0x05, 0x00}, {0x06, 0x00}, {0x0b, 0x00} }, /* IDLE */
131 { {0x1f, 0x00}, {0x0d, 0x00}, {0x00, 0x00}, {0x01, 0x00}, {0x8f, 0x09}, {0x8f, 0x01} }, /* DRSHIFT */
132 { {0x1f, 0x00}, {0x0c, 0x00}, {0x08, 0x00}, {0x00, 0x00}, {0x8f, 0x09}, {0x8f, 0x01} }, /* DRPAUSE */
133 { {0x1f, 0x00}, {0x0d, 0x00}, {0x07, 0x00}, {0x97, 0x00}, {0x00, 0x00}, {0x01, 0x00} }, /* IRSHIFT */
134 { {0x1f, 0x00}, {0x0c, 0x00}, {0x07, 0x00}, {0x97, 0x00}, {0x08, 0x00}, {0x00, 0x00} }, /* IRPAUSE */
135 };
136
137 static void amt_jtagaccel_reset(int trst, int srst)
138 {
139 if (trst == 1)
140 aw_control_rst |= 0x4;
141 else if (trst == 0)
142 aw_control_rst &= ~0x4;
143
144 if (srst == 1)
145 aw_control_rst |= 0x1;
146 else if (srst == 0)
147 aw_control_rst &= ~0x1;
148
149 AMT_AW(aw_control_rst);
150 }
151
152 static int amt_jtagaccel_speed(int speed)
153 {
154 aw_control_baudrate &= 0xf0;
155 aw_control_baudrate |= speed & 0x0f;
156 AMT_AW(aw_control_baudrate);
157
158 return ERROR_OK;
159 }
160
161 static void amt_jtagaccel_end_state(tap_state_t state)
162 {
163 if (tap_is_state_stable(state))
164 tap_set_end_state(state);
165 else {
166 LOG_ERROR("BUG: %i is not a valid end state", state);
167 exit(-1);
168 }
169 }
170
171 static void amt_wait_scan_busy(void)
172 {
173 int timeout = 4096;
174 uint8_t ar_status;
175
176 AMT_AR(ar_status);
177 while (((ar_status) & 0x80) && (timeout-- > 0))
178 AMT_AR(ar_status);
179
180 if (ar_status & 0x80) {
181 LOG_ERROR(
182 "amt_jtagaccel timed out while waiting for end of scan, rtck was %s, last AR_STATUS: 0x%2.2x",
183 (rtck_enabled) ? "enabled" : "disabled",
184 ar_status);
185 exit(-1);
186 }
187 }
188
189 static void amt_jtagaccel_state_move(void)
190 {
191 uint8_t aw_scan_tms_5;
192 uint8_t tms_scan[2];
193
194 tap_state_t cur_state = tap_get_state();
195 tap_state_t end_state = tap_get_end_state();
196
197 tms_scan[0] = amt_jtagaccel_tap_move[tap_move_ndx(cur_state)][tap_move_ndx(end_state)][0];
198 tms_scan[1] = amt_jtagaccel_tap_move[tap_move_ndx(cur_state)][tap_move_ndx(end_state)][1];
199
200 aw_scan_tms_5 = 0x40 | (tms_scan[0] & 0x1f);
201 AMT_AW(aw_scan_tms_5);
202 int jtag_speed = 0;
203 int retval = jtag_get_speed(&jtag_speed);
204 assert(retval == ERROR_OK);
205 if (jtag_speed > 3 || rtck_enabled)
206 amt_wait_scan_busy();
207
208 if (tms_scan[0] & 0x80) {
209 aw_scan_tms_5 = 0x40 | (tms_scan[1] & 0x1f);
210 AMT_AW(aw_scan_tms_5);
211 if (jtag_speed > 3 || rtck_enabled)
212 amt_wait_scan_busy();
213 }
214
215 tap_set_state(end_state);
216 }
217
218 static void amt_jtagaccel_runtest(int num_cycles)
219 {
220 int i = 0;
221 uint8_t aw_scan_tms_5;
222 uint8_t aw_scan_tms_1to4;
223
224 tap_state_t saved_end_state = tap_get_end_state();
225
226 /* only do a state_move when we're not already in IDLE */
227 if (tap_get_state() != TAP_IDLE) {
228 amt_jtagaccel_end_state(TAP_IDLE);
229 amt_jtagaccel_state_move();
230 }
231
232 while (num_cycles - i >= 5) {
233 aw_scan_tms_5 = 0x40;
234 AMT_AW(aw_scan_tms_5);
235 i += 5;
236 }
237
238 if (num_cycles - i > 0) {
239 aw_scan_tms_1to4 = 0x80 | ((num_cycles - i - 1) & 0x3) << 4;
240 AMT_AW(aw_scan_tms_1to4);
241 }
242
243 amt_jtagaccel_end_state(saved_end_state);
244 if (tap_get_state() != tap_get_end_state())
245 amt_jtagaccel_state_move();
246 }
247
248 static void amt_jtagaccel_scan(bool ir_scan, enum scan_type type, uint8_t *buffer, int scan_size)
249 {
250 int bits_left = scan_size;
251 int bit_count = 0;
252 tap_state_t saved_end_state = tap_get_end_state();
253 uint8_t aw_tdi_option;
254 uint8_t dw_tdi_scan;
255 uint8_t dr_tdo;
256 uint8_t aw_tms_scan;
257 uint8_t tms_scan[2];
258 int jtag_speed_var;
259 int retval = jtag_get_speed(&jtag_speed_var);
260 assert(retval == ERROR_OK);
261
262 if (ir_scan)
263 amt_jtagaccel_end_state(TAP_IRSHIFT);
264 else
265 amt_jtagaccel_end_state(TAP_DRSHIFT);
266
267 /* Only move if we're not already there */
268 if (tap_get_state() != tap_get_end_state())
269 amt_jtagaccel_state_move();
270
271 amt_jtagaccel_end_state(saved_end_state);
272
273 /* handle unaligned bits at the beginning */
274 if ((scan_size - 1) % 8) {
275 aw_tdi_option = 0x30 | (((scan_size - 1) % 8) - 1);
276 AMT_AW(aw_tdi_option);
277
278 dw_tdi_scan = buf_get_u32(buffer, bit_count, (scan_size - 1) % 8) & 0xff;
279 AMT_DW(dw_tdi_scan);
280 if (jtag_speed_var > 3 || rtck_enabled)
281 amt_wait_scan_busy();
282
283 if ((type == SCAN_IN) || (type == SCAN_IO)) {
284 AMT_DR(dr_tdo);
285 dr_tdo = dr_tdo >> (8 - ((scan_size - 1) % 8));
286 buf_set_u32(buffer, bit_count, (scan_size - 1) % 8, dr_tdo);
287 }
288
289 bit_count += (scan_size - 1) % 8;
290 bits_left -= (scan_size - 1) % 8;
291 }
292
293 while (bits_left - 1 >= 8) {
294 dw_tdi_scan = buf_get_u32(buffer, bit_count, 8) & 0xff;
295 AMT_DW(dw_tdi_scan);
296 if (jtag_speed_var > 3 || rtck_enabled)
297 amt_wait_scan_busy();
298
299 if ((type == SCAN_IN) || (type == SCAN_IO)) {
300 AMT_DR(dr_tdo);
301 buf_set_u32(buffer, bit_count, 8, dr_tdo);
302 }
303
304 bit_count += 8;
305 bits_left -= 8;
306 }
307
308 tms_scan[0] =
309 amt_jtagaccel_tap_move[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())][0];
310 tms_scan[1] =
311 amt_jtagaccel_tap_move[tap_move_ndx(tap_get_state())][tap_move_ndx(tap_get_end_state())][1];
312 aw_tms_scan = 0x40 | (tms_scan[0] & 0x1f) | (buf_get_u32(buffer, bit_count, 1) << 5);
313 AMT_AW(aw_tms_scan);
314 if (jtag_speed_var > 3 || rtck_enabled)
315 amt_wait_scan_busy();
316
317 if ((type == SCAN_IN) || (type == SCAN_IO)) {
318 AMT_DR(dr_tdo);
319 dr_tdo = dr_tdo >> 7;
320 buf_set_u32(buffer, bit_count, 1, dr_tdo);
321 }
322
323 if (tms_scan[0] & 0x80) {
324 aw_tms_scan = 0x40 | (tms_scan[1] & 0x1f);
325 AMT_AW(aw_tms_scan);
326 if (jtag_speed_var > 3 || rtck_enabled)
327 amt_wait_scan_busy();
328 }
329 tap_set_state(tap_get_end_state());
330 }
331
332 static int amt_jtagaccel_execute_queue(void)
333 {
334 struct jtag_command *cmd = jtag_command_queue; /* currently processed command */
335 int scan_size;
336 enum scan_type type;
337 uint8_t *buffer;
338 int retval;
339
340 /* return ERROR_OK, unless a jtag_read_buffer returns a failed check
341 * that wasn't handled by a caller-provided error handler
342 */
343 retval = ERROR_OK;
344
345 while (cmd) {
346 switch (cmd->type) {
347 case JTAG_RESET:
348 #ifdef _DEBUG_JTAG_IO_
349 LOG_DEBUG("reset trst: %i srst %i",
350 cmd->cmd.reset->trst,
351 cmd->cmd.reset->srst);
352 #endif
353 if (cmd->cmd.reset->trst == 1)
354 tap_set_state(TAP_RESET);
355 amt_jtagaccel_reset(cmd->cmd.reset->trst, cmd->cmd.reset->srst);
356 break;
357 case JTAG_RUNTEST:
358 #ifdef _DEBUG_JTAG_IO_
359 LOG_DEBUG("runtest %i cycles, end in %i",
360 cmd->cmd.runtest->num_cycles,
361 cmd->cmd.runtest->end_state);
362 #endif
363 amt_jtagaccel_end_state(cmd->cmd.runtest->end_state);
364 amt_jtagaccel_runtest(cmd->cmd.runtest->num_cycles);
365 break;
366 case JTAG_TLR_RESET:
367 #ifdef _DEBUG_JTAG_IO_
368 LOG_DEBUG("statemove end in %i", cmd->cmd.statemove->end_state);
369 #endif
370 amt_jtagaccel_end_state(cmd->cmd.statemove->end_state);
371 amt_jtagaccel_state_move();
372 break;
373 case JTAG_SCAN:
374 #ifdef _DEBUG_JTAG_IO_
375 LOG_DEBUG("scan end in %i", cmd->cmd.scan->end_state);
376 #endif
377 amt_jtagaccel_end_state(cmd->cmd.scan->end_state);
378 scan_size = jtag_build_buffer(cmd->cmd.scan, &buffer);
379 type = jtag_scan_type(cmd->cmd.scan);
380 amt_jtagaccel_scan(cmd->cmd.scan->ir_scan, type, buffer, scan_size);
381 if (jtag_read_buffer(buffer, cmd->cmd.scan) != ERROR_OK)
382 retval = ERROR_JTAG_QUEUE_FAILED;
383 if (buffer)
384 free(buffer);
385 break;
386 case JTAG_SLEEP:
387 #ifdef _DEBUG_JTAG_IO_
388 LOG_DEBUG("sleep %" PRIi32, cmd->cmd.sleep->us);
389 #endif
390 jtag_sleep(cmd->cmd.sleep->us);
391 break;
392 default:
393 LOG_ERROR("BUG: unknown JTAG command type encountered");
394 exit(-1);
395 }
396 cmd = cmd->next;
397 }
398
399 return retval;
400 }
401
402 #if PARPORT_USE_GIVEIO == 1
403 int amt_jtagaccel_get_giveio_access(void)
404 {
405 HANDLE h;
406 OSVERSIONINFO version;
407
408 version.dwOSVersionInfoSize = sizeof version;
409 if (!GetVersionEx(&version)) {
410 errno = EINVAL;
411 return -1;
412 }
413 if (version.dwPlatformId != VER_PLATFORM_WIN32_NT)
414 return 0;
415
416 h = CreateFile("\\\\.\\giveio",
417 GENERIC_READ,
418 0,
419 NULL,
420 OPEN_EXISTING,
421 FILE_ATTRIBUTE_NORMAL,
422 NULL);
423 if (h == INVALID_HANDLE_VALUE) {
424 errno = ENODEV;
425 return -1;
426 }
427
428 CloseHandle(h);
429
430 return 0;
431 }
432 #endif
433
434 static int amt_jtagaccel_init(void)
435 {
436 #if PARPORT_USE_PPDEV == 1
437 char buffer[256];
438 int i = 0;
439 uint8_t control_port;
440 #else
441 uint8_t status_port;
442 #endif
443 uint8_t ar_status;
444
445 #if PARPORT_USE_PPDEV == 1
446 if (device_handle > 0) {
447 LOG_ERROR("device is already opened");
448 return ERROR_JTAG_INIT_FAILED;
449 }
450
451 snprintf(buffer, 256, "/dev/parport%d", amt_jtagaccel_port);
452 device_handle = open(buffer, O_RDWR);
453
454 if (device_handle < 0) {
455 LOG_ERROR(
456 "cannot open device. check it exists and that user read and write rights are set");
457 return ERROR_JTAG_INIT_FAILED;
458 }
459
460 i = ioctl(device_handle, PPCLAIM);
461 if (i < 0) {
462 LOG_ERROR("cannot claim device");
463 return ERROR_JTAG_INIT_FAILED;
464 }
465
466 i = IEEE1284_MODE_EPP;
467 i = ioctl(device_handle, PPSETMODE, &i);
468 if (i < 0) {
469 LOG_ERROR(" cannot set compatible mode to device");
470 return ERROR_JTAG_INIT_FAILED;
471 }
472
473 control_port = 0x00;
474 i = ioctl(device_handle, PPWCONTROL, &control_port);
475
476 control_port = 0x04;
477 i = ioctl(device_handle, PPWCONTROL, &control_port);
478
479 #else
480 if (amt_jtagaccel_port == 0) {
481 amt_jtagaccel_port = 0x378;
482 LOG_WARNING("No parport port specified, using default '0x378' (LPT1)");
483 }
484
485 #if PARPORT_USE_GIVEIO == 1
486 if (amt_jtagaccel_get_giveio_access() != 0) {
487 #else /* PARPORT_USE_GIVEIO */
488 if (ioperm(amt_jtagaccel_port, 5, 1) != 0) {
489 #endif /* PARPORT_USE_GIVEIO */
490 LOG_ERROR("missing privileges for direct i/o");
491 return ERROR_JTAG_INIT_FAILED;
492 }
493
494 /* prepare epp port
495 * clear timeout */
496 status_port = inb(amt_jtagaccel_port + 1);
497 outb(status_port | 0x1, amt_jtagaccel_port + 1);
498
499 /* reset epp port */
500 outb(0x00, amt_jtagaccel_port + 2);
501 outb(0x04, amt_jtagaccel_port + 2);
502 #endif
503
504 if (rtck_enabled) {
505 /* set RTCK enable bit */
506 aw_control_fsm |= 0x02;
507 }
508
509 /* enable JTAG port */
510 aw_control_fsm |= 0x04;
511 AMT_AW(aw_control_fsm);
512
513 enum reset_types jtag_reset_config = jtag_get_reset_config();
514 if (jtag_reset_config & RESET_TRST_OPEN_DRAIN)
515 aw_control_rst &= ~0x8;
516 else
517 aw_control_rst |= 0x8;
518
519 if (jtag_reset_config & RESET_SRST_PUSH_PULL)
520 aw_control_rst &= ~0x2;
521 else
522 aw_control_rst |= 0x2;
523
524 amt_jtagaccel_reset(0, 0);
525
526 /* read status register */
527 AMT_AR(ar_status);
528 LOG_DEBUG("AR_STATUS: 0x%2.2x", ar_status);
529
530 return ERROR_OK;
531 }
532
533 static int amt_jtagaccel_quit(void)
534 {
535
536 return ERROR_OK;
537 }
538
539 COMMAND_HANDLER(amt_jtagaccel_handle_parport_port_command)
540 {
541 if (CMD_ARGC == 1) {
542 /* only if the port wasn't overwritten by cmdline */
543 if (amt_jtagaccel_port == 0) {
544 uint16_t port;
545 COMMAND_PARSE_NUMBER(u16, CMD_ARGV[0], port);
546 amt_jtagaccel_port = port;
547 } else {
548 LOG_ERROR("The parport port was already configured!");
549 return ERROR_FAIL;
550 }
551 }
552
553 command_print(CMD_CTX, "parport port = %u", amt_jtagaccel_port);
554
555 return ERROR_OK;
556 }
557
558 COMMAND_HANDLER(amt_jtagaccel_handle_rtck_command)
559 {
560 if (CMD_ARGC == 0) {
561 command_print(CMD_CTX,
562 "amt_jtagaccel RTCK feature %s",
563 (rtck_enabled) ? "enabled" : "disabled");
564 return ERROR_OK;
565 } else {
566 if (strcmp(CMD_ARGV[0], "enabled") == 0)
567 rtck_enabled = 1;
568 else
569 rtck_enabled = 0;
570 }
571
572 return ERROR_OK;
573 }
574
575 static const struct command_registration amtjtagaccel_command_handlers[] = {
576 {
577 .name = "parport_port",
578 .handler = &amt_jtagaccel_handle_parport_port_command,
579 .mode = COMMAND_CONFIG,
580 .help = "configure or display the parallel port to use",
581 .usage = "[port_num]",
582 },
583 {
584 /**
585 * @todo Remove this "rtck" command; just use the standard
586 * mechanism to enable/disable adaptive clocking. First
587 * implement the standard mechanism and deprecate "rtck";
588 * after a year or so, it'll be safe to remove this.
589 */
590 .name = "rtck",
591 .handler = &amt_jtagaccel_handle_rtck_command,
592 .mode = COMMAND_CONFIG,
593 .help = "configure or display RTCK support",
594 .usage = "[enable|disable]",
595 },
596 COMMAND_REGISTRATION_DONE
597 };
598
599 struct jtag_interface amt_jtagaccel_interface = {
600 .name = "amt_jtagaccel",
601 .commands = amtjtagaccel_command_handlers,
602
603 .init = amt_jtagaccel_init,
604 .quit = amt_jtagaccel_quit,
605 .speed = amt_jtagaccel_speed,
606 .execute_queue = amt_jtagaccel_execute_queue,
607 };
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